CN2187606Y

CN2187606Y - Safety position limiter for hoist

Info

Publication number: CN2187606Y
Application number: CN 94200401
Authority: CN
Inventors: 冯常励
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-13
Filing date: 1994-01-13
Publication date: 1995-01-18
Anticipated expiration: 2004-01-13

Abstract

The utility model relates to a control device for the hoisting of hoists, particularly a vertical elevating space-limiting device for the lifting transport box (in which heavy objects are arranged) of a hoist. The utility model is provided with a space-limiting switch, a speed reducer which is connected with the shaft of a hoist through the input shaft of the speed reducer is arranged on the housing of the hoist, a cam which is connected with the speed reducer through a camshaft is arranged at the output shaft end of the speed reducer, and the protruding block of the cam is contacted with the contact of the space-limiting switch. Accordingly, collision forces for the space-limiting switch can be small, and the service life of the space-limiting switch can also be extended. The utility model has the advantages of safe mounting and dismounting, and convenient maintenance.

Description

Safety position limiter for hoist

The utility model relates to a kind of winch elevator control setup, refers to that especially winch promotes the vertical lift inhibiting device of carrying case (in weight is arranged).

As everyone knows; the building operation building site extensively utilizes winch to drag carrying case (cage) and make vertical transport on well cabinet frame or portal frame; trailing carrying case is spacing to be absolutely necessary with safety guard; at present; generally adopt limit switch to be arranged on carrying case on well cabinet frame or the portal frame slide rail; on the position of required hoisting depth, the direct control winch, thus guarantee the spacing height and the safety of carrying case.But because it is big to be dragged carrying case (dress thing) impulsive force, the collision contact of limit switch easily breaks or limit-switch positions such as is moved at accident, load and unload and maintenance difficult outside height simultaneously, the cable that connects limit switch is oversize, in addition, limit switch easily gets rusty again in the open, even damages.

In view of this, the purpose of this utility model provides a kind of winch elevator safety limiting device, converts the corresponding corner of winch to the carrying case lifting position, and touches limit switch with the projection of cam.

The purpose of this utility model is achieved in that it has limit switch, the retarder that connects the elevator arbor with its input shaft is set on the winch casing, be provided with its camshaft bonded assembly cam at this reducer output shaft end, and the projection of cam and limit switch contact touch.

Because adopt such scheme: limit switch is subjected to impact force little, and is safe and reliable, loading and unloading and easy to maintenance, limit switch also can prolong service life.

Below in conjunction with drawings and Examples the utility model is further specified.

The structural representation of Fig. 1 the utility model exemplary embodiments.

Among the figure: 1, winch, 11, the elevator arbor, 12, casing 2, retarder, 21, input shaft, 22, output shaft, 23, worm screw, 24, worm gear, 25, miniature gears, 26, big gear wheel, 27, the case shell, 3, cam, 31, projection, 32, camshaft, 4, limit switch.

Drop-gear box 2 is to be made of input shaft 21, output shaft 22, worm screw 23, worm gear 24, miniature gears 25, big gear wheel 26 and case shell 27.Fixedly be supported in case shell 26 on the casing 12 of winch 1, its input shaft 21(is the worm shaft of worm screw 23) connect elevator arbor 11 with plunging joint, and output shaft 22 usefulness plunging joints connect the camshaft 32 of cam 3; One of worm screw 23() the reduction of speed ratio with worm gear 24 is 80, and the reduction of speed ratio of a pair of

gear

25,26 is 1.875, and the number of teeth of replaceable a pair of

gear

25,26 changes speed ratio, to meet the spacing requirement that the carrying case needs promote differing heights.

Cam 3 can be guaranteed safety again for setting the biplane cam of the projection 31 that radially staggers mutually on the upper and lower two-wheeled edge respectively to satisfy carrying case in the height upper and lower limit that regulation promotes; Cam 3 upper and lower take turns projection 31 respectively with limit switch 4(margin microswich) when contact touched, the motor (not shown) of winch 1 stopped, and adds the worm and gear self-locking, winch 1 is slack.

Claims

1, a kind of winch elevator safety limiting device has limit switch, it is characterized in that: the retarder that connects the elevator arbor with its input shaft is set on the winch casing, be provided with its camshaft bonded assembly cam at this reducer output shaft end, and the projection of cam and limit switch contact touch.

2, by the described winch elevator of claim 1 safety limiting device, it is characterized in that: above-mentioned cam has radially stagger the mutually upper and lower two-wheeled of projection of band.

3, by the described winch elevator of claim 1 safety limiting device, it is characterized in that: above-mentioned retarder has worm gear pole and a pair of gear.